i used jandd expedition rear rack and they held up nicely.

i know the jandd expedition front rack does not fit the surly lht 56cm, but the 62 might have the clearance. you can find someone who can weld aluminum to chop the corners off the front rack that hits the diagonal lower tube (the tube that holds 2 water bottles) reverse them and weld them back... or use a hammer, whatever turns your wheels...

but i think they are damn good racks.

for the front, make sure they are beefy, the front wheel moves about a lot, and if they are not nicely welded, they can crack.

best!